There are some people here who dabble in love magic and may be able to help you.
However, personally I believe if you get your lover back by magical means they won't love you the way you love them, or you two will still fall apart for some reason because you two obviously have problems and that's why you aren't together.
Magic isn't the answer to everything. Try other means before resorting to magic, though again I don't recommend using magic. And if nothing works then try to accept the fact that you two are over and attempt to move on.